help in simple logic problem

https://www.electro-tech-online.com/attachments/untitled-jpg.50082/
https://www.electro-tech-online.com/attachments/untitled-jpg.50083/

I have a counter connected to to latch throught DeMUX
the problem is:
look at the first picture, when I click on A (input button which is zero), the first latch will go high and THEN second will go low and while this THEN, 1 is "sent" (transformed to 0 with NOT gate) from the first one and 1 from the second one (transformed to 1 with NOT gate), so in this tiny interval, 01 is being sent to Demux and it sets the latch (01 means the first pin, so it sets first pin to 1 and the latch is being set). After this long discussion I hope you get the point. How to solve it? Simply speaking, the to latches form a "counter", which, after increasing to 2, on next step it quickly goes to 1 and then to 3. how to remove this 1????? So on the second pic there should be 1 on D (look at the first one)
I have attached LOGISIM file for those who have the program

I notice that you have your clock edge wired to both the T input and Clock input of the T flip-flop. I know nothing about your simulator, but in any real logic family, this is a real NO-NO! Look up the Set-Up and Hold requirements for a T-flop.

Yes but it didn't solve the problem (see attachment), thanks anyway for correction!

That seems a silly way to build what appears to just be a 3 bit ripple counter? What is using the 2 bit demux supposed to accomplish?

The glitch comes from the fact that the demux is decoding a two-bit ripple counter, which if you consider some reasonable propagation delay through the T-flops causes the decoding of transient states. A cardinal rule of logic-design is "NEVER decode the bits of a Ripple Counter" If you must decode the states of a counter, then use a synchronous counter that counts in a Gray code, and that will guarantee glitch-less decoding.

That is for bigger project, All i want this to do is to count in decimals. just put high the first pin of demux, then second, then third and then forth. a very simple problem which am I STUCK in. after 2 it just jumps to 1 for maybe picoseconds or less, but is enough for any logic "step", and the latch changes. I want this inaccuracy to be removed. heeelppppP!!!!!

ok sorry i didn't know the rule and can you suggest any book or something for such "rules" and whole digital electronics? I want to learn digital electronics!

and plz can you give the schematics of the "Grey code counter"? the counter which will fit my circuit

Read this thread. It'll get you started.

Also, a CMOS 4017 decade counter internally is a glitchlessly decoded 5bit Johnson counter which counts by tens. Download the data sheet and study its internal wiring...