Plenty of people here who have far more knowledge than me on plant growing. If no one comments soon, I would suggest posting another thread with a better title that would draw those knowledgeable people to come give you advice. Maybe a title like "Plant issue. Some growing, some dying", "Need help. Plants dying" or something like that. And post it under the "Fertilizers and Water Parameters" section or "Plants" section.
Be sure to list as much info as you can, such as the questions above (include the answers you already gave), pH, even ammonia, nitrite, nitrate levels, plant condition before you got them and after, maybe even GH and KH if you know those, etc.
Dwarf Baby Tears are a pretty demanding plant, so it's most likely melting/dying because your tank conditions (lighting, nutrients, co2 levels) are not sufficient to grow it.
That large anubias, with the one bad shape leaf, looks like it might have been grown emersed (above water), so it might melt as it transition to submersed growth and will slowly grow new leaves.
Do you have any info on what co2 system you are using?