Some shipments of Facebook's Oculus Rift and HTC's Vive virtual reality headsets are being delayed, according to the companies.
The Oculus delay was attributed to a shortage of some of the VR headset's components, according to Mashable, which cited an email sent to Rift customers.
The first Rift headsets were shipped last week, according to the company.
"We're working as fast as we can to get Rifts to customers who pre-ordered," a post on the official Oculus blog said last week. The company said people who preordered the headsets would get an email one to three weeks prior to shipping, then another when the headset is shipped.
Oculus Rift preorders opened on Jan. 6 and the first shipments were made on March 28. In an attempt to compensate for the delayed shipments, shipping will be free for all preorders, according to a tweet by Oculus CEO Brendan Iribe.
New Oculus Rift orders are expected to be shipped in July, according to the Oculus website.
Some orders of HTC's Vive headset, one of the biggest competitors to the Oculus Rift, are being delayed because of a payment processing error, according a post on that company's blog on Saturday. Some payments for the devices processed by Digital River were mistakenly declined, and as a result, those orders were canceled, according to HTC.
"We're actively working to resolve this, and have already reinstated orders for some customers. We want to assure our customers that we'll work with them to process their payment so they can receive their Vive when they were expecting it," according to a company blog post.
Neither Facebook nor HTC immediately responded to CNBC's request for comment.