Buzzing mystery

First of all say hello! is my first post.
I just finished an Ukelele, not the first one that I have made but I'm having a buzzing problem that I haven't had before, Th uke Buzz on the two middle strings (2,3) from fret 1 to 7, the buzz I think that comes from the bridge area so I checked the saddle and make it as round as possible on the top but the buzz still there, any help!

I wish I had an answer for you - unfortunately, I'm having the exact same problem (same strings and frets) with a tenor that I just built. I've concluded that it is an internal buzz (something loose inside the body) rather than a string buzzing on a high fret
You'll note that the strings and frets affected are the lowest frequency notes on the uke (assuming you have a "high" G string).
I've tried dribbling super glue down the edges of the fan braces on the top and around the bridge plate area. Didn't make a difference. It's winter dry at my house and I'm hoping higher humidity will swell things up a bit and make a positive difference.

i have a similar problem with my kala flame maple tenor. I contacted the seller. fortunatly he's pretty local and he'd going to take a look at it.

I'm not sure that is not a frets problem but I feel that is something inside of the body. but after to try several things like:
-Change strings
-Tune it half step higher
-Rise the saddle
-Press the string stronger
The buzz still there.
Just right know I tried another thing that make me think that although the frets seems to be flat. I checked it with a rule several times. If I place a 3mm brass rod in place of the fret makeing the action extremely higher the buzz disappers, but once more when I check it with a rule the frets and fretboard is flat.

Check for flatness across the fretboard...and check to see if the neck is twisted or not.

If the buzzing sound is only coming when you fret the strings up to the 7th fret my gut feeling is fret buzz. Though I have had one uke cross my work bench that had a saddle that wasn't sitting in a nice flat saddle slot. That one took some time to track down. Only buzzed on the A string. I flattened the saddle bottom and would get it to stop for awhile, but it would come back. Finally ended up making a jig to route the slot again with a nice clean flat bottom.

The go to for mystery fret buzz at Frank Ford's site... http://www.frets.com/fretspages/luthier/Technique/Setup/BuzzDiagnosis/buzzlist.html

Allen said:

If the buzzing sound is only coming when you fret the strings up to the 7th fret my gut feeling is fret buzz. Though I have had one uke cross my work bench that had a saddle that wasn't sitting in a nice flat saddle slot. That one took some time to track down. Only buzzed on the A string. I flattened the saddle bottom and would get it to stop for awhile, but it would come back. Finally ended up making a jig to route the slot again with a nice clean flat bottom.

Click to expand...

I will check it, I just realise that the saddle slot is not flat and on the sides is deeper, I can see some gap between the bone and the "bridge".