  JWST observations of the strongly lensed galaxy The Sparkler have revealed a
population of gravitationally bound globular cluster (GC) candidates. Different
analyses have resulted in broadly similar ages but significantly different
metallicities, questioning the assembly history that has led to the formation
of such a population. In this letter, we re-analyse the two sets of photometry
available in the literature with the code MCMAME especially tailored to fit
physical properties of GCs. We find the ages and metallicities from both
datasets are consistent within 1 $\sigma$ uncertainties. A significant group of
GCs is consistent with being old and metal poor ([Fe/H] $\sim -1.7$). For this
group, the ages do not converge, hence, we conclude that they are definitively
older than 1 Gyr and can be as old as the age of the Universe. The remaining
GCs have younger ages and a metallicity spread. The ages and metallicities
distribution of GCs in the Sparkler are consistent with those observed in Local
Group's galaxies at similar lookback times. Comparing with predictions from
E-MOSAICS simulations we confirm that the Sparkler GC population traces the
self-enrichment history of a galaxy which might become a few times $10^9$
M$_{\odot}$ massive system at redshift $z = 0$
