If you click multiple times on the ... button in the Properties widget for any property that opens a NumberSequence timeline widget, multiple widgets will open with duplicated contents.
This doesn’t happen for ColorSequence properties.
To reproduce:
Insert a ParticleEmitter
Click repeatedly on the ... button beside the Transparency property
Earlier today and for the past weeks or so, I’ve been working with UI elements such as many properties and frames/texts and earlier like I mentioned now, I found some sort of glitch/bug whenever I enable the Transparency section under the UIGradient property, I found out that you could spam the ... or just accidentally click it; If this is intentional, then this is terrible UX and terrible option(s) to have multiple sequences or tabs open for a single property.
This is reproducible and happens inside Roblox Studio, and it started happening weeks ago or so whenever I work with UIGradient and such, and a good description of this bug is that it’s the transparency properties but it’ll pop up more whenever clicking on it, I purpose that it should only have one like other properties.
Studio Version: 0.448.0.411244 (64-bit) as of 9/24/2020.
This might be happening to other UI elements that have something similar to the ... button with Transparency if I recall, probably not as I don’t use most UI elements like that.