0.50 delay after exporting added to sound file?...[SOLVED]

Hi, I notice when I edit a wav file or mp3 to make so there isn’t any delay, then I export the file and reopen it, Audacity adds a 0.50 delay to the beginning on the file. Why is this and can this be adjusted some how?

0.5 Seconds?

Milliseconds, it is still a delay.

For MP3 format that is unavoidable. Encoder/decoder overall delay is not defined, which means there is no official provision for gapless playback.
WAV format does not have this limitation so the issue should not be occurring when you export as WAV.
(OGG, FLAC and AIFF do not have this limitation either).