Iron normal but UIBC- 450 & TIBC- 550.

Hello, I am 28 years old female. I got infected with Covid 6 months back and since then I have been experiencing high heart rate, fatigue, brain fog and missed menstrual cycle. My heart is structurally normal, hence my Doctor ordered iron & ferritin test. Back then, my iron was 70, hb- 11, b12-259, UIBC- 329, Iron binding capacity- 408 and ferritin-5 only. Doctor advised me iron syrup as my ferritin was too low. I took it for 20-25 days & had to stop it due to consistent diarrhoea. I repeated my iron test and currently my Iron has increased from 80 to 130, Hb from 11 to 12, UIBC from 329 to 450 , Total iron binding capacity from 408 to 550 Ferritin from 5 to 7. There is an increase in iron & ferritin levels, so in that case UIBC & TIBC should reduce but they both have increased beyond the range. My current UIBC is 450 & TIBC is 550. Does it mean my iron is not getting absorbed? Please help in understanding this. Thank you!