What dose are you using.
Are you really really careful, so you do not spill the gel on the floor?
There is whole crowd of people with your experience.
Standard answer is that most likely it is due to thyroid problems.
I am guessing that there may be another reasons.
If you have blood tests, you may want to post complete blood tests here.
complete name, number, units, range, what laboratory have done the testing, detailed description of when (time) you have drawn your blood in relation to your usual time when you apply the T.