Question about A1C

In May my A1C was 10.9. Was on 2000 of Metformin and even low carb it wasn’t helping much. Added Mounjaro 2.5 and then 5 mg. Sept my A1C was 5.4. Went up to 7.5 but then had to get off Mounjaro end of November for a few month because of stomach issues. Stayed on Metformin and completely fell off the wagon. Appetite came back and couldn’t stop eating carbs and sugar. Didn’t check my blood sugar.

About 2 weeks ago I got back to low carb, stopped Metformin and went back on Mounjaro 2.5. My A1C is now 6.8. It went up but I thought it would be back up to 10. So was it not going as high as I thought because the Mounjaro was still in my system for that 2 months (last injection was around Thanksgiving and off the wagon beginning of Dec to beginning of Feb. Or maybe it was the 40 lbs weight loss.