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Rob Kardashian, Robert Kardashian

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Not quite sure what's going on with Rob Kardashian these days?

You're not alone. A source tells E! News that family members are "confused" by Rob's recent behavior both online and in real life. They also think that the 28-year-old is acting "weird"—and we're guessing his recent romance with Blac Chyna has something to do with that.

So, E! News can confirm that Rob is dating Tyga's ex-fiancée, but a source notes there's "concern" that 27-year-old Blac Chyna is "preying" on him "during a week time." The insider is also concerned that Blac Chyna, who has a 3-year-old son with Tyga named King Cairo, is only using Rob to get back at Kylie Jenner (who's had an on-again, off-again romance with the 26-year-old rapper herself).

Kylie Jenner, Rob Kardashian, Blac Chyna

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Kylie, we're told, doesn't want to further her long-rumored feud with Blac Chyna, so she's doing her best to avoid it altogether. Because, as one insider tells E! News, the 18-year-old Keeping Up With the Kardashians star "doesn't want to give [Blac Chyna] the attention she so obviously wants."

Rob, however, is taking the opposite approach to Kylie's when it comes to the model. On Tuesday, he reposted an Instagram meme of Blac Chyna carrying a car seat from an entertainment Instagram account, Entertainment Prescription. The caption read: "Blac Chyna probably out shopping rite now as she plan to give birth to the only next generation of the Kardashian Name! #BabyKardashian"

He's joking (we think), and it wouldn't be the first time Rob's been a bit of an odd duck when it comes to social media. Back in March, he posted a photo comparing sister Kim Kardashian to "The bitch from Gone Girl" (aka Rosamund Pike's seriously scary character). He deleted the image within a few days, and a source told E! News there wasn't ever actually any bad blood between Rob and Kim. "He's just being crazy and he thinks it's funny," said an insider at the time, adding that Rob "can just be a little bizarre with his humor."

Rob Kardashian, Lamar Odom

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Rob can't turn everything into a laughing matter, though—especially when it comes to matters involving his health. In late-2015, he fell ill over the holidays which led to a sudden hospitalization followed by a diabetes diagnosis. Sources told E! News it "was a wake up call" for him to focus on losing weight and taking his health more seriously.

The entire family is there as a support system for Rob, and a source tells E! News he's also leaning on Lamar Odom, who is going through a major recovery of his own. Rob has visited Lamar at the house Khloe rented for him, a source tells E! News, noting that the guys have found some comfort in each other during trying times.

—Additional reporting by Melanie Bromley