Frustratingly, stalls can happen once or multiple times while your losing. They can last for a week to 3 or 4 weeks. If they persist, have a chat with your dietician/nutritionalist to review your diet. Sometimes a small tweak can kick start your loss again.
I also think you’ve answered some of your own question by saying you’ve let your food choices slide a little (we’ve probably all done it at some time). Best is to get back on your plan re food choices, portion sizes, etc.
I have a small window of calorie intake variation to maintain (don’t check my calories everyday but do random checks) & recently I’ve put on a little weight. I’ve realised, in my attempt to up my protein intake a bit (since my gall was removed I don’t absorb it well) I’ve increased my calories. Increasing my portion size of meat (3oz to 4), throwing in some beans to my lunch salads, etc. & there’s the reason for the weight gain. Though I reduced the amount of vegetables I was eating the calorie difference was not enough to compensate. Can’t believe I didn’t realise. My surgeon’s doctor has put me back on Creons to help with protein absorption & I’m going back to my previous eating habits.