What is my forum's real version?

[yahsuah]

My forum's version is written as vb 3.8.7 PL1 on my Admin CP (inside)
But, it is written as 3.7.3 on login page of my Admin CP (before logging)
Also, it is written as 3.7.3 on diagnostic test page (admincp/diagnostic.php?do=list)

How can I sure which is my forum's real version?

[ForceHSS]

Reinstall 3.8.7 pl1 files and run upgrade you must not of upgrade right before

[yahsuah]

Thank you