Often only the "Worklog Id" can be seen there. "Time Spent" and "Remaining Estimate" are only displayed after (sometimes multiple) page refresh. In a detail view it rarely works, in a single issue display it works better.
If WLP is not installed, then I cannot reproduce the problem.
Jira Server 7.12.0
Do you have hide time tracking setting turned on from add-on settings? If it is, which settings are you using?
I use the Jira default.