Zoo Med ReptiSun 5.0 UVB mini Compact Fluorescents are totally inadequate (let me guess - it came with the tank kit right ?) , your globe is subpar because it's likely a 13W and it's only rated 5% UVB.
I'd return the Zoo Med ReptiSun 5.0 UVB mini Compact Fluorescent 13W or 25W version (neither is adequate) and exchange it for a Exo Terra 26W UVB200 for now.
The shop should have the better globe in stock and will be able to swap as the prices are very similar , if they wont , take your business elsewhere .
Investment in a 26W UVB200 will get you out of trouble for about 6 months if set up right ( aim for 180 microW UVB / sq.cm at the basking spot and 100 microW UVB / sq.cm elsewhere in the warm zone.
Guide :
The dragon needs to be able to bask inside 8" from a 26W UVB200 (10% UVB) is it's mounted in a dome or nano-hood and NOT ontop the mesh lid.
I'm not a fan of D3 "fortified" calcium , as the synthetic vitamin D3 is not the same isomer as the natural form and will not be efficiently absorbed or metabolized in a reptile's body unlike the natural vitamin D3 that the lizard will make through photosynthesis on its absorbing UVB from the sun or a UV source. There is also a buffering reaction in the lizard's blood too which will restrict absorbance and metabolisation of dietary calcium, the fake D3 interfers with the absorbtion of calcium and restricts the concentration of Ca in the lizard's bloodstream.
Be careful on doseage of fake D3 mixed with calcium ,
Short term is OK , but long term can result in hypercalcemia and vit D3 toxicity.