They love you!
I have learned that this becomes more of an "issue" with buns who get a lot of say in when and where they want to be at, i.e all the partial and full freeroam buns. I say it in quotation marks since it isn't a bad behaviour per se, just a bit inconvenient for us to cohabit with buns with these particular traits.
The degree of "attached" behaviour is also quite directly linked to the buns' true personalities. Just depends on who you get. I had Musti who just knew when to keep clear respectfully but would otherwise honk and throw his love at me, then LĆ¼mi that would kiss me to death and seek out my sleeping form but not get in my feet, and currently i have Storm who is completely oblivious to the fact that we can't just safely hop over him instantly or binky our butts away from the chair he jumps into just a split second before we are about to land. Like, he sees me trying to take a seat and then he decides that he has to land on that exact same spot at the exact same time as me.... Iris is more difficult to pin because she's just glued herself to Storm, and she was bonded quite young, so i can no longer tell what is her own personality and what is being his buddy.
Nothing to "fix" the toppling bun problem, just a few tips to make it safer:
1) squat before sitting. It helps avoid accidentally smushing bun under one's bum even if said bun was determined to be right then&there. If I see Storm's beady eyes lookin' like he wants to, i pretend to sit to see if he'll come or let me take my seat before jumping over. If he comes, i can just scoot him over or urge him back down safely. I've dealt with this long enough to just read his body and get a gist.
2) be mindful of bun's pal. Depending on what personalities you end up with, more lookout might be needed. Or less. When Storm was paired with LĆ¼mi, he never really got in my way and didn't follow Storm around; i just had to see where the white one was beforehand. Now that Storm is paired with Iris, i have to think Storm x 2 because the girl will follow suit right after. Usually she's kind enough to hop in from another open side, but if they happen to band together to beg for attention, i'll have to watch out for both buns' jumps.
3) zombie shuffle. That's probably what you need the most along with a decent sense of balance. Deemed to be one of the safer ways of walking with unexpected buns. The whole point is to not really lift one's legs and to do small/fast rather than big/high steps. Essentially just scoot or shuffle your feet low on the floor so that buns wouldn't be able to get under your feet nor topple you as easily. If they come too close, the small shuffle steps will just push them out of the way rather than accidentally sending them flying or you toppling over.
4) fixed meal times. Most buns will eagerly await their fresh batch of hay veg and pellets, pestering people endlessly. If they have fixed meal times, their excited shimmying might become just a bit more predictable. Ours' pellet time is 19.00 and i know to expect buns' eager hops around me when the time is near. In the same vein, i know they likely won't bother me after that as they're full and resting.
5) perked up ears. This might not help others as much as it does for me, but i have learned to listen/distinguish my buns hopping to me from afar and nearby. This usefulness depends on the flooring, rabbits' nail length, their size, hopping pattern/speed and more. LĆ¼mi was roughly the same size of 3.5-3.6kg as Iris. On the same type of floor, with slow hops, with trimmed nails, LĆ¼mi made much more noise than the girl does. Both my frenchies were 5.4-5.6kg and Musti walked louder than Storm does. When i'm aware of buns walking nearby, i can usually hear them hopping to me, so i know when to stare at the floor and switch over to zombie shuffle.
Hope that something here might be of help to you.