TL;DR the weight loss caused you to lose a bit off your bench so you now can only lift 315 lbs instead of 340 lbs - which was an all-time max, so arguably what you could get for a single on any given day was probably closer to 320-330 lbs at the time. That means you've probably lost no more than 5-15 lbs off your bench, which is very reasonable considering you've lost 25 lbs (well done, btw).
Now, at 5'5-6 and 250 lbs you were really quite fat - probably 30% bodyfat or so, maybe more. At 235 lbs and 5'5-6 you're still fat unfortunately. That means you're not carrying that much muscle, so any bodyweight you lose is REALLY going to hit your bench.
I wouldn't worry too much in that case, because you're still benching a respectable amount (three plates is respectable as far as I'm concerned unless you're a PLer) and getting leaner. When you reach the leanness you want, you can start building your bench back up. Clean up your diet, train a bit harder and things will fall into place over time.