Place 4 Pusher/Attractor/One Waylike this
X X
X X

Stand in the middle, and you will get boosted way to hard

Yes it kinda is
for example
if you are moving from one oneway to another one you will gain extra speed while being in both
here are some other things that really shouldnt be possible
https://streamable.com/65ucd

Why shouldn't it be possible ? I don't get the problem

That's hard to avoid and is it really a problem?

I'd say the effect stacking mechanic is actually quite useful