I have several forms where I use the render as button functionality with radio button selections. The strange thing I am experiencing is that the appearence of the buttons has changed at least 3 times in our environment in the recent past.

At first they looked quite normal:

After we installed another Add On they where suddently sqeezed together:

Another Add On installation caused the to change the look again. This time the selected buttons where blue:

After we deactivated the farm feature of this Add On again the where sqeezed again:

Has anyone any idea how I can prevent this? Nintex Support was not able to solve this issue. They just told me that there must be some master CSS that is changed. Can anyone point me in the right direction to solve this issue?