Another user & I observed the following:
We can not upvote questions when using an iPad.
This effect is happening
- only for questions
- only for upvotes
- only on iPad (will check and edit with specific details)
- when using Safari
- on graduated sites p, e.g. Seasoned Advice and English Language Learners.
All other voting functions are fine and the effect does not happen on an iPhone. The app is also not affected.