Problem about the boxes are gray in the Dataentry DHIS2

Hello all,
I have a problem on the mask seized DHIS2, I always look for the
solution, with versions of browsers but no solutions so far, the
problem is that if I connect with the account for the seizure, the
boxes are gray, I uninstalled browsers and I reinstalled but not
suites. can you help me?
I think it's a problem with the nternet, low flow signal or what then?