My video flicks to a darker exposure after I export

[Nicholas5F89]

When I play my video all the way through on premier it is fine. Once I export it h.264, after about 10 seconds. The exposure changes to a darker tone . Im not sure why it keeps doing this 

[Ann Bens]

[Nicholas5F89]

 

 

[basil1891]

Either export with software encoding, or try this workaround: https://community.adobe.com/t5/premiere-pro/having-text-on-screen-makes-video-brighter/m-p/11686646#...