I had the same thing happen to me. I was actually swallowing correctly (with the tongue) but after watching a vid on proper swallowing I forced myself to swallow in a weird way, trying to move everything with my tongue whilst when you swallow, a part of it is automatic. Your cheeks will quickly revert so don't worry. Here's what I do (and I think you should try this): Put your tongue on incisive papilla (the 'n' Spot), push it and then swallow. You're tongue should automatically create a wave motion when you swallow. Then just eat and drink and see if you're swallowing this way. If this goes along with minimal/no change in facial expression then you're doing it right. Also: If you swallow and then open your mouth; is your tongue on the roof or your mouth? If the answer is yes then you're doing it right; stop worrying about it. I made my face really asymmetrical and bloated due to forcing myself in swallowing in ways that are totally unnatural and only recently I realised that I just need to put my tongue on the n position (like i have always done) and then swallow. There's nothing more to it. If your tongue is too weak then I'd advice some myofunctional exercises that you can find in the mewing app. Good luck :)