It's a glitch, many people report it in reddit thread:

https://old.reddit.com/r/Twitter/comments/14ntk2k/rate_limit...

For me (web version in Chrome):

Home page - "Something went wrong. Try reloading."

Individual tweets - "Sorry, you are rate limited. Please wait a few moments then try again." + "Something went wrong. Try reloading."

Interestingly, lists still work as usual.

UPD1 There's a spike of reports: https://downdetector.com/status/twitter/

UPD2 Lists also display "Something went wrong. Try reloading." intermittingly now, spike on downdetector keeps growing