I haven't run across this glitch personally, so all I can recommend is loading up a save well before you tried this and leveling your character to 28 or 30 (where X-01 armor starts spawning). If that fixes the sentry bot and door glitch make sure you check the armor itself, it consistently appears as T-51 on spawn while it is actually X-01 (it corrects itself after you interact with it). If that doesn't work there should be another full set at the South Boston Military Checkpoint, provided you haven't gone there pre-lvl 28/30. Hope this helped in some way.