We are aware of this and are constantly working on optimizing the pedometer! However, you should keep in mind that different pedometers calculate in different ways and it is very difficult to tell which one is actually measuring correctly. We have chosen to use to following pedometers as of right now: Google Fit, Apple Health and FitBit as we believe these to be the most reliable. If you download one of these and sign up with the same email as Stepler, we can retrieve your steps from as we have made a direct link to it and we cannot guarantee that other pedometers will work as well or at all.
With that said, we are working on adding more pedometers in the feature but this can be quite a complicated process so we cannot provide exact dates when new ones will be available.