I also think it is burns....the yellow rings around the burn is fungi. Bacteria will decimate the plant quicker. I suggest you water more often=your plants are dehydrated. Do not follow the weekly watering regimen you read sometimes. The watering must depend on your environment and grow zone. Water as needed (that was drilled on my mind by the senior members when I was a newbie) or master the skewer technique.
You were given expert advice by the others. I would listen to them.

@bobits Hello :)

@bud what is skewer technique?

The skewer technique is very helpful for many of us. I use it in most of my orchids. Just get some inexpensive bamboo kebab skewers as you would see in dollar store and stick one near the centre and down into each pot. When you think it might be time to water, pull out the skewer and see if it is wet, damp, bone dry, etc. Based on that you will know how the media is down in the centre of the pot where it is slowest to dry and most likely to cause rot if too wet. I replace the skewer into the same spot so I don't stab roots every time. For Phals I would water when it is just damp but not too wet. for Cattleyas I would likely wait till it is pretty close to dry.