Recently I have been having an issue where after I have saved my assembly and closed it , upon opening it it says I have mate errors and then it re-arranges some of the mates to create a lot of red errors. Usually it will mate different faces . Say I had a 32mm tee and a pipe mated to one end it would moved the concentric mate to another position then flag it up in red. Has anyone else got any issues like this as its been troubling me for a few months now since I went to 2017 SolidWorks 3D. In the picture attached you can see that on first inspection the mates look wrong but when you open up the mate they are on the original axis.With picture 4 and 5 I can see that pic 4 was the mate as it was when I originally created it and pic 5 is after I loaded the save file and then the mates went red and my assembly became jumbled up.