Compare the glass blocks with candle items especially cyan color and light blue color.
Obviously the glass block colors are using the old color system before 1.12. Although their textures were updated in 1.14 but the color have never been updated.
These textures should be updated to match the current colors.
Thank you for your report!
We're tracking this issue in MC-214641, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki