When merging layers the effect is lost

Good Morning leslie. Thank you for your responds, I usually do this when im merging layers, however Im still have the same problem. I worked with EXR for example and when I have several 3d renders (from the EXR) with blending modes active, lets say on render layer with screen with 80% opacity, another render leyer with overlay with 25% opacity in the blender mode.. and on brightness layer with mask for another render leyer  and maybe a fill color with a blendmode actived  with opacity too  once I merge all this, having my beuty render pass at the bottom... the color changed, or I lost the ajusments on those layers that has the blending mode with opacities.  

I found a way to fix it and yes, I have to rasterize all the mask first, then I have to merged from the beauty layer (bottom to top) and merged by groups, not the hole layers.,

I'm wondering if theres another way to fix this, and if is totally related with the participation that one of the expert mention at the top of the chat 

"issue can arise that the effect of Adjustment Layers or combinations of Layers with certain Blend Modes seems to disappear or weaken on flattening an image or saving a copy in a format that does not support Layers"

if so, can you please recoment a foro or any place where we can learn in more deep about this problem to understan how to work implement a better workflow inside of this ajustmen layer on psd?

thank you so much.

Sore point … it used to be possible by setting the Cache Level to 1 (if one was willing to make the performance-trade-off). 

But that was broken years ago and hasn’t been fixed so far … 

Feel free to add your vote to the Bug Report. 

https://community.adobe.com/t5/photoshop-ecosystem-bugs/p-impossible-to-set-cache-levels-to-1/idi-p/12248951

Hi

c.pfaffembichler is spot on in his answer. When zoomed out, Photoshop shows a blended 8 bit previews not the actual image (even when in 16 bit image mode). For 99%+ of images the effect is not notiocable but for the type of image he demonstrates it becomes very visible.

The answer is simple - compare the before merge and after merge at 100% zoom. At that zoom level the full image data is blended on screen so the results should match.

Dave