SQL Logfile Used % showing very large number

SQL Logfile Used % showing very large number

We are using OpManager to monitor our SQL servers. We have a database that is being mirrored that we are trying to monitor but it is not working properly. When we look at "Logfile Used %" it is showing "9223372036854776000 %" used, on the primary server of the mirror it shows as "4 %." I tried removing the mirrored copy from OpManager and added it back, however it still shows this large number. The log file size is only 150 MB. Any ideas on how to correct this?

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