Rob Kardashian, 27, deleted all of his old Tweets and Instagram pics on Monday and began anew.
The cleaning of the digital slate came after a weekend that saw him skipping his sister Kim Kardashian and Kanye West's wedding in Italy.
"Friends at the wedding expressed serious concern for him," a close Kardashian friend, who attended the wedding, tells PEOPLE. "When I saw him, it looked like something was very wrong."
"I'm not sure [it's] solely related to weight gain," the source continues. "His friends and family are rooting for him."
When Kim's only brother flew to Paris for the pre-wedding celebration, he was "not feeling like himself," a second source tells PEOPLE of the sock designer's reason for flying out before the couple tied the knot in Florence.
Rob, who has been struggling with his weight, has 4.9 million followers on Twitter and sent out a "happy memorial day" message on Monday after he deleted all of his old Tweets and photos. He then posted a line from the Bible and positive messages of support for the armed forces.
"Blessed is the nation whose God is the LORD. Psalm 33:12," he wrote and followed it up with "Lord Jesus, protect those who protect me- police, firefighters, and those in the military."
It's not the first time Rob has deleted Tweets. In December 2012, he went on a Twitter rant about a cheating ex-girlfriend, only to later remove the messages. And just last month, while the rest of his family were on vacation in Thailand, he Tweeted, "No one will ever understand how much it hurts," before purging his entire Twitter feed.
Some have questioned if Rob's Twitter account was hacked (pointing out that he is now primarily following a number of porn stars), but he also Tweeted a birthday message to his sister Kourtney's boyfriend, Scott Disick, on Monday. "Love you brother!" he wrote, sharing a pic of the two of them goofing around on vacation.
A Kardashian family rep has declined to comment.
Blessed is the nation whose God is the LORD. Psalm 33:12— ROBERT KARDASHIAN (@robkardashian) May 26, 2014
Lord Jesus, protect those who protect me- police, firefighters, and those in the military.— ROBERT KARDASHIAN (@robkardashian) May 26, 2014
Teach me to pray for them and to honor them for their service. Amen.— ROBERT KARDASHIAN (@robkardashian) May 26, 2014