This is a pattern I often encounter on flop, both facing cbets, and as a stab opportunity ip.

2pair with the top and bottom card is slowplaying quite frequently, but I couldn't come up with a satisfying reason for why.

All that I heart was something like "Top two is stronger and bottom two unblocks top pair, while top-bottom gets counterfeited on mid card pairing" or something along those lines but it doesn't completely convince me.