I’m having the exact same issue, luckily the site is still in development but I’d like to get resolved as soon as possible.
Wasn’t an issue at the start, not sure if the latest WordPress Update caused it, otherwise I’m seriously stumped.
NEWSFLASH: Some of us have customers/clients that use IE because that’s what they’re used to. Shall we just forget about 35% of our client base because it’s a terrible browser?