I may have an answer for you, it’s called muscle memory. While trying to build a stairway, you have to lay it out before you start cutting. My instructor said that height of a standard step is 8”. That means from the top of the prior step to the top of the next step is exactly 8”. As you learn to walk, you brain instinctively raises your foot 8”. As time passes, it becomes muscle memory, so that without thinking, your brain lifts your leg 8”.

Have you ever tripped on a step or stepped hard going down a step? If you have, you’ll find out the step was higher than 8” or lower than 8” but your muscles memory remembers exactly 8”. Ever step down to hard from a curb or trip stepping up on a sidewalk? Same reason, it was either more than 8” or less. Sometime in your recent past you tripped and your brain decided to raise your leg a little higher. Now your muscle memory has adjusted your stepping height and does it without thinking. That’s probably why your doctor noticed your unusual gait. You might be able to retrain your muscle memory by walking up and down stairs by looking down at each step and mentally only lift it to the height of the step.

Of course, there could be a medical reason why your gait changed but most people when they trip, it’s because of the 8” muscle memory did not adjust to the wrong height and you didn’t notice it. Hope this helps. @becky1024