You are taxed on a cumulative basis so you have to look at the situation in prior weeks to get the full picture. You were on emergency tax in previous weeks so on 27 Feb got a refund of tax overpaid in prior weeks.
In the current week your gross income is €1747, the pension is deducted from that €176 giving you a taxable income of €1,571 multiply that by 20% gives you €314 less your tax credits (3,300 / 26) of €127 leaves you with a PAYE bill for the fortnight of €187. This will be the basis going forward unless your overtime brings your cumulative taxable earnings above your standard rate cut off point when the excess will be subject to 41% income tax.