SC2 mission Last Stand issue

The mission Last Stand (protoss campaign)I can’t move my units across four ramps. It looks like there is an invisible wall. The ramps surround my base and Xel’Naga temple. Why?

Yes i have the same problem as well i tried it in prologue and doing the rest of the Protoss campaign in lotv

i made posts around this problem on twitter and a recording of it.