Negative repair value in the Argipinaa System

I am playing the Imperial campaign,and just completed the mission where you rescue the Ministorum guy from the tyranids. After that mission I redeployed my fleets to the agripinaa system only to realize the next turn that all my fleets had been reduced to zero, forcing me to spend all my resources to repair them. I looked at it and realized that the system's repair value had gone from 12, to- 3000, constantly bringing my fleets to zero health. As it is, this bug has forced me to stop playing, an i cannot continue with my campaign.

Sounds crazy... But I guess a screenshot would be helpful. And also showing what level your small and big shipyards there have, to maybe be able to understand how that value accrued.