I just experienced the same problem while playing Strike on PC on 2018-01-03 at 22:42 US EST.
Here is a video I recorded of the bug:
https://youtu.be/NsouCZMprBMYou can see that the score is 0–0. Then I delivered the package, resulting in a score of 1–0. When the timer for the start of the next round reaches 0, the score is shown as 1–1, and my team instantly lost before even spawning. You can see the confusion over this in the chat box. The round timer then starts over, counts down to 0, and we spawn with a score of 1–1, when it should have been 1–0.