1095 heat treating questions

[King Fuzz]

I am sometimes getting these imperfections in my blades after heat treat. I only use 1095 or old files. It does not happen all the time. Sometimes like the knife in the pic here only one side does it. Trying to add the pic from imgur.

 

[King Fuzz]

Picture

 

[King Fuzz]

https://imgur.com/a/knife

 

[King Fuzz]

https://imgur.com/a/knife

https://imgur.com/a/knife

 

[King Fuzz]

https://imgur.com/a/knife