Trachyphyllia in constant feed me mode?

[eyesolator]

As the title say one of my trachyphyllias in is always open with it's feeding tentacles exposed. Everything else in the tank is happy, chalices, acans, SPS, and other LPS. It's color is good and will eat when given food and shrinks up after lights out as usual.
The only parameters I monitor are:
ALK. 8.4
Cal 420
pH 8.33
Salinity 1.025

Thanks,
John

https://goo.gl/photos/tJ3Utyiz2t9tMts78
https://goo.gl/photos/ePugiNsgHcjF4wSj7
Tank Pic
https://goo.gl/photos/pYaJiFBfi1MkNNfM8