When you’re prompted with weird level requirements for dungeons during Legion Timewalking, make sure to leave Chromie Time!
Blizzard has reduced the level requirements for Timewalking in Patch 10.1.7, allowing players Level 45 and above to queue up for Timewalking Dungeons. However, some players on live servers are now getting some weird level requirements, like ThyCynicalPolish here.
Simply, disable Chromie Time and queue again. This should resolve the issue and allow you to queue for Timewalking Dungeons!