JTFF Tazz

Last night there was a random flight. After undoing an SU27, the contact remained locked in TWS, with a straight trajectory. Contact which did not exist, therefore ghost, visible on the SA page, at the HMD, and with the helmet sight at almost 170 ° behind me. Could not unlock it and it was indicated at mach 1.9 to 0ft. The radar lock bug with the NWS on the ground is also still present. Thank you