Hi - I did a little googling and found that it is a type of stricture in your stomach tube. Sounds like your may be minor? Do you have vomiting issues?
An example in the most legible language I could find from a website (https://www.southwestsurgery.com.au/sleeve-gastrectomy/complications-of-laparoscopic-sleeve-gastrectomy) discussion possible complications:
"Stricture (narrowing) of the gastric tube
Stricture formation (narrowing) can occur in sleeve patients, and most commonly presents itself in a later phase after the surgery. Common symptoms include food intolerance, or nausea and vomiting. Narrowing can occur due to removing too much of the stomach, twisting or kinking at the angle of the stomach (incisura) or scarring related to inflammation. Endoscopic dilation of the narrowing with a balloon tend to help the patients however, this often need to be repeated. In extreme cases reoperation is needed often involving performing a gastric bypass operation. Prevention is the key to eliminate this problem with proper surgical technique, leaving ample of room near the angle of the stomach, proper use of the sizing tube, and the prevention of kinks or twist in the gastric sleeve by suturing the omentum back to the entire staple line."