1/2nl cash: 2 pr on 3 flush board

[mb6tour]

I don't understand flop shoving here, take a look at that:

Board: 9s Js 7s

Wins Ties Equity
44.50% 1.04% 45.54% ( Jd7h )
53.41% 1.04% 54.46% ( QT, T8, As2+, As2s+, TsJ, Ts9, J9, JJ, 77, 99, 86, 8s9, Ks2s+, Ks2+ )


Dunno if it's weak but I'm checking this turn. I'm with a very weak hand given the cirscunstances and to control the size of villain's bet on the river is pretty much my only concern. With a possible str8 + 3-flush on the board it's hard to distinguish between villain being on a draw or with an already made hand, making it very hard to call/fold to big bets on the river even if it's a brick, hence the pot control. Thoughts?