I have had the same kind of feeder for years and was on my third one.
They just wear out!

My most recent one came crashing to the ground because the plastic base cracked and loosened the grip on the glass jar.

My local pet shops don't have the same kind so I had to order it online.
It will take several days for it to get here.

In the meantime I am using another type that has a glass jar for the liquid, but the base is metal rather than plastic - and holes rather than
"flowers" around the holes. They figured out how to use it soon enough, but it is really clear that they don't like it. They have hovered in front of me too - and I just tell them to be patient a few more days.

It is also hot - and I think the liquid gets hot - too hot for them to drink.

Maybe that is the message they are sending to you????

Do you have any pictures of the type of hummingbirds you have in your area?