What should I see in your screenshot?
I do not have access to your local server, and I can not test this.
Also, I don’t know how you got your tiles.
I remember that you exported them.
But here the problem may be a little earlier:
How did you generate mbtiles?
Are you sure you had the correct tiles in mbtiles?
Also, where did you download dem from?
If you didn’t download it using RWT Helper, you are sure that this is correct data, because on the Internet there are two (at least) different sets of SRTM data that have the same filenames but are not compatible.
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