alirezapir

for anyone having the same problem, for those developing a theme from scratch who encounter the same issue, adding the following code to the themes style sheet worked for me:

img.alignright { float: right; margin: 0 0 1em 1em; }
img.alignleft { float: left; margin: 0 1em 1em 0; }
img.aligncenter { display: block; margin-left: auto; margin-right: auto; }
.alignright { float: right; }
.alignleft { float: left; }
.aligncenter { display: block; margin-left: auto; margin-right: auto; }

reference:

https://stackoverflow.com/a/41339528/4225644

@macmanx @joyously Sorry i just changed it to see if any alignment works.
now its set to center but still same problem…