I Got problems with a HD44780 based Pled.
Some charachter are Double so, when i type Mhz, my
display view Mhzz.
this problem is random.
I use a short cable to connect with my PC.
Here is a picture of my Pled
When I use an another LCD its works fine
I hope to hear from you soon. I get more of this Pleds,
when you need someone te test you can get him for free.