Current limiter its not working as it should?
The image below is your circuit with the base clamp transistor Q2 flipped so it does not look like a "twister" session :-).

The circuit should work "well enough" IF you have connections correct and IF Q2 collector actually connects to Q1 base - there is some doubt fom the supplied diagram whether this connection exists (see circuit at end). 

BUT the CC circuit and CV circuit are fighting each other. As Q1 current is limited by Q2 the Vout drops and the opamp drives Q1 harder to provide more voltage and current rises so Q2 .... . This is probably a race to the death. Maybe not. 

If you move the Q1 Q2 block "upstream" and provide a new Q3 driven by the opamp as Q1 was then this separates the two functions. Ultimately you can only have CC or CV dominant at any one time so one has to "lose" but in simulation this may give you better investigative control. You do not say what "when I lower the resistance" means in Ohms or what current you then see or if this was bricks and silicon or simulation (presumably the latter).