What web browser do you use? And what is the make and model of your monitor?
If you have a wide gamut monitor, and are using the Edge browser or Internet Explorer, which are both not color managed, colors will be over saturated and wrong.
Im using Chrome on my phone and on my computer. My monitor is a Dell P2715Q 4k monitor...
Chrome is color managed, and should display correct colors even if you have wide gamut monitor (as far as I can tell, you don't).
But when two color managed applications display different colors, it's usually due to a defective or incompatible monitor profile.
Try setting the monitor profile to sRGB. If that fixes the issue, you should ideally calibrate your monitor with a hardware calibrator.
Go to Control panel > Color management. Make sure that Use my settings for this device is checked. Add the sRGB profile, and set it as Default.
You can't expect to see correct colors on a phone, they do not have color management.
Forgot to mention that you have to restart Lightroom and Chrome after changing the monitor profile, so that they become aware of the new profile.