Your issue might caused by two conflicting plugin features:
– The picture lazy loading from Jetpack,
– The avatar image cropping from BuddyPress.
You can disable lazy loading from your Jetpack settings and your issue should be solved.
If you want to improve your page loading times, we recommend you to consider WP Rocket (https://wp-rocket.me/) as a caching solution. This is the solution we use to improve our demo performances. You can activate image lazy loading and yet exclude specific pages, like the user profile.
? 2021 is coming
Starting from December 21, 2020 until the January 3, 2021 included, our response is expected to be longer as we’ll be facing a shortage of staff. Be sure we’ll do our best to provide you the best support possible.
We thank you for your understanding and we wish you a merry Christmas and a happy new year. ??