I have an iPhone 7. I only recently synced it to the Messages app on my computer. At first, I received text alerts on both devices, but now, when I have the computer open (not the computer's Messages app, just the computer) and get a new text, I get an alert on my computer but my phone doesn't light up. If I check my phone's lock screen, I can see that I got a new text, I just can't get my phone to alert me. When I close the computer, however, I receive alerts just fine.
Has anyone else experienced this? Is it normal or is there something I can do to fix it? Do Not Disturb and message forwarding are disabled.