This is a really good question and this question can be answered after you go to get an evaluation at your chiropractor.
When you had your strain, your body had to compensate for the lack of motion due to the muscle strain so your whole body had to compensate by overactivating other muscle around or maybe you walked more on the other ankle to avoid pressure and pain in the affected ankle. Even after the signs of strains are resolved (no more swelling, redness, pain, etc.), you still have to make sure that your body is back in the right place, including your spine, pelvis and, obviously, knees, ankles, and feet.
The pressure you still feel could be caused by overactive muscles, scar tissue, or sequela from your strain, which didn’t heal completely. Sprain/strains take a long time to completely heal sometimes (over 12 weeks is not uncommon), but you need to make sure that no nerves or muscles or joints around aren’t still needing some attention and possible chiropractic adjustments, muscle work, or strengthening exercises.
I would advise you to go seek the opinion of a chiropractor who then, after evaluating you, will be able to give you the exact cause of that lingering pressure.
Hope this helps,
Dr. Jessica Grichy, DC