Unable to change graph axis titles.

Using Excel 2013

Good day,

Working on some graphs for my thesis and ran into a problem; I can't seem to edit the titles of the X and Y axis, which now says "Axis Title".
What I tried is: Selecting the "Axis Title" box, right clicking it and in the menu press "Edit Text". The cursor becomes available in the text box, but I can't type in the textbox or delete the current "Axis Title". I can make the "Axis Title"-text bold, cursive or do similar layout adjustment. I find this really weird and can't seem to get around it. Anyone know how to simply change the text?

I just solved the problem, it was apparently some glitch. After restarting excel completely I could change the text again.