I was playing around with harmonics on my e-cello, and noticed that when pressing at the first one (half-length), the pitch was higher than when merely touching for the harmonics itself. I thought it was something to do with my bridge set up and only managed to break the A string in the process of adjusting it (was old anyway and the whole set needed changing). Then I tried on my acoustic cello, and noticed the same.
So my question is: is there something quite wrong with my set-up, and I should bring even the acoustic cello to a luthier for adjustment, or is natural because pressing on the string bends it and so the pitch has to be higher than when merely touching it lightly? (only logical explanation that I could come up with)
Thanks in advance!